Display Panel Edge Wiring Layout for Narrow-Bezel Defect Repair
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Solution Overview
Problem
Narrow frame and frameless displays face challenges with narrow line width and high wiring density, requiring improved methods to maintain yield and satisfy display area requirements.
Innovation Solution
A display panel design featuring a substrate with a light-emitting diode array, driving circuit, connecting line, transparent conductive layer, and passivation layers, where the transparent conductive layer extends to cover the connecting line and aligns with the substrate's side surface, allowing for easy defect detection and repair before cutting, and a conductive layer connects the driving circuit to the transparent conductive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the connecting line is placed close to the substrate edge to reduce cutting area, then the thickness of the cutting area is reduced, but defect detection and repair become difficult
Solution Approach 1:
The transparent conductive layer is extended to cover the connecting line before the final cutting process. This preliminary action allows defect detection and repair to be performed on the connecting line while it is still accessible and visible, before the substrate is cut to the final narrow frame dimensions. The extended transparent conductive layer serves as both a protective cover and an accessible interface for testing and repair operations.
2Difficulty of detecting and measuring
If the transparent conductive layer covers the connecting line, then defect detection and repair are facilitated, but the structure becomes more complex
Solution Approach 1:
The transparent conductive layer performs multiple functions: it serves as an electrical conductor, a protective passivation layer, and an extended test interface that covers the connecting line. By making the transparent conductive layer extend beyond the substrate edge to cover the connecting line, a single structural element accomplishes both its primary electrical function and provides an accessible interface for defect detection and repair, eliminating the need for separate test structures.
3Ease of repair
If the connecting line is spaced from the substrate edge, then defect repair is easier, but the cutting area thickness increases
Solution Approach 1:
The solution extends the transparent conductive layer into the cutting area dimension, allowing the connecting line to be spaced from the substrate edge while maintaining accessibility for repair. The extended transparent conductive layer provides a continuous interface that spans from the substrate interior through the cutting area to the exterior, enabling defect repair operations to be performed on the connecting line without requiring direct access to the substrate edge, thus resolving the conflict between repair ease and cutting area thickness.
Data Source
AI summary
A display panel includes a substrate, an LED array disposed on the front side of the substrate, a driving circuit disposed on the front side of the substrate and connected to the LED array, a connecting line and a transparent conductive layer disposed on the back side of the substrate. The connecting line is spaced apart with a side surface of the substrate thereby defining a cutting area. The transparent conductive layer extends from the cutting area and at least partially covering the connecting line. The display panel further includes a first passivation layer and a conductive layer. The first passivation layer is disposed on the transparent conductive layer and the connecting line. The side surfaces of the first passivation layer, the transparent conductive layer, and the substrate are aligned. The conductive layer penetrates the first passivation layer to connect the transparent conductive layer to the driving circuit.